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1Step 1
- The button is connected to pins 2 and GND, no power
- The echo and trigger pins from the HC-SR04 are connected to pins 7 and 8, powered by 5V
- The LCD is connected to pins 4, 5, 6, 11, and 13, powered by 3.3V
- The transistor is connected to pins 9, and 5V, and the laser
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